Dr. Elchin Jafarov is a research associate at the National Snow and Ice Data Center, at the Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder. He has a PhD in Geophysics and a masters degree in Mathematics both from the University of Alaska Fairbanks. The main focus of his graduate research was a numerical modeling of permafrost thermal dynamics. Currently, he is working with global terrestrial ecosystem model to estimate the amount of carbon that could be released to the atmosphere from thawing permafrost. The first part of his talk will be an introduction to the current state of permafrost modeling. In the second part he will introduce current challenges in modeling of the permafrost carbon feedback.